using System;

​

public class Program {

  public static void Main() {

    Console.WriteLine("Enter your code:");

    var inputCode = Console.ReadLine();

    Console.Clear();

    VerifyInputCode(inputCode);

  }

  public static void VerifyInputCode(string inputCode) {

    int secretCode = 1125;

    bool IsRunning = true;

    while (IsRunning) {

      while (inputCode.Length != 4) {

        Console.WriteLine("Invalid code.");

        Console.Write("Code must be 4 digits.");

        inputCode = Console.ReadLine();

        Console.Clear();

      }

      if (Convert.ToInt32(inputCode) == secretCode) {

        Console.WriteLine("Congtrazzz!! you got it. :)");

        IsRunning = false;

      } else {

        Console.WriteLine("Opps!!! Wrong Code");

        Console.Write("Reenter Code.");

        inputCode = Console.ReadLine();

        Console.Clear();

        IsRunning = true;

      }

    }

  }

}